What is the primary goal of human communities?
O
A. To safeguard human culture and language
O
B. To understand group behavior through observation
O
C. To make and follow rules through political organization
O
D. To satisfy human needs by working together

The energy needs of a human population are not affected by

What evidence supports the law of conservation of energy? a) mechanical energy is converted to chemical energy during photosynthesis. b) oxygen is made from the breakdown of carbon dioxide during photosynthesis. c)energy is absorbed by chlorophyll and becomes chemical energy during photosynthesis. d)the sun gives off light energy that is absorbed by plants.

The picture represents a structure of the respiratory system. which is the function of this structure? to bring air into the body to exchange oxygen with carbon dioxide to carry air to the lungs to release oxygen from the body